上海交通大学学报

上海交通大学学报

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撬棒启动下高比例风电系统阻抗矩阵修改与短路电流抑制

  

  1. 1. 国网江苏省电力有限公司电力调度控制中心，南京 210024；

    2. 国网江苏省电力有限公司扬州供电分公司，江苏 扬州 225000；

    3. 上海交通大学 电力传输与功率变换控制教育部重点实验室，上海 200240

  • 作者简介:刘盛松（1974—），高级工程师，从事电力系统优化与控制研究。
  • 基金资助:
    国网江苏省电力有限公司科技项目（J2023152），国家自然科学基金（U2166207）资助项目

Modification of Impedance Matrix and Short-Circuit Current Suppression in High-Proportion Wind Power Systems with Crowbar Activation

  1. 1. State Grid Jiangsu Electric Power Co. Ltd. Power Dispatching and Control Center, Nanjing 210024, China；

    2. State Grid Yangzhou Power Supply Company, Yangzhou 225000, Jiangsu, China；

    3. Key Laboratory of Control of Power Transmission and Conversion, Shanghai Jiao Tong University, Shanghai, 200240

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摘要： 双馈风机为代表的风力发电短路电流特性与同步机不同，其故障前后等效阻抗不一致，导致含高比例风电系统的短路电流计算不准。提出一种适用于风电高渗透下的大规模电网短路电流快速计算方法及抑制策略。通过分析双馈风机转子侧动态响应特征，量化了双馈风机故障前后等效阻抗变化，并修改系统节点阻抗矩阵。将故障限流器（Fault current limiter, FCL）等效为并联阻抗避免了节点阻抗矩阵的求逆运算，提出阻抗单元迭代配置方法合理配置FCL并抑制短路电流。结果表明，所提方法可实现含风电系统短路电流的抑制，相对其他方法，所需FCL数量更少、容量更小，且计算效率更高。

关键词: 双馈风机, 短路电流, 限流器, 节点阻抗矩阵

Abstract: The short-circuit current characteristics of wind power generation systems represented by doubly-fed induction generators (DFIGs) differ from those of synchronous generators. The inconsistent equivalent impedance of DFIGs before and after faults leads to inaccuracies in short-circuit current calculations for power systems with high wind power penetration. This paper proposes a rapid calculation method and suppression strategy for large-scale grid short-circuit currents under high wind power penetration. By analyzing the dynamic response characteristics of the rotor side of DFIGs, the variation in equivalent impedance before and after faults is quantified, and the system node impedance matrix is modified. The fault current limiter (FCL) is equivalently modeled as a shunt impedance to avoid matrix inversion operations in the node impedance matrix. An iterative impedance unit configuration method is proposed to optimize FCL placement and suppress short-circuit currents. Simulation results demonstrate that the proposed method effectively suppresses short-circuit currents in wind-integrated systems. Compared with existing approaches, the proposed method requires fewer FCLs with smaller capacity while achieving higher computational efficiency.

Key words: doubly-fed induction generators (DFIGs), short-circuit current, fault current limiter, node impedance matrix

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